1 /* Common mmap definition for Linux implementation. 2 Copyright (C) 2017-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef MMAP_INTERNAL_LINUX_H 20 #define MMAP_INTERNAL_LINUX_H 1 21 22 #include <stdint.h> 23 24 /* This is the minimum mmap2 unit size accept by the kernel. An architecture 25 with multiple minimum page sizes (such as m68k) might define it as -1 and 26 thus it will queried at runtime. */ 27 #ifndef MMAP2_PAGE_UNIT 28 # define MMAP2_PAGE_UNIT 4096ULL 29 #endif 30 31 #if MMAP2_PAGE_UNIT == -1 32 static uint64_t page_unit; 33 # define MMAP_CHECK_PAGE_UNIT() \ 34 if (page_unit == 0) \ 35 page_unit = __getpagesize (); 36 # undef MMAP2_PAGE_UNIT 37 # define MMAP2_PAGE_UNIT page_unit 38 #else 39 # define MMAP_CHECK_PAGE_UNIT() 40 #endif 41 42 /* Do not accept offset not multiple of page size. */ 43 #define MMAP_OFF_LOW_MASK (MMAP2_PAGE_UNIT - 1) 44 45 /* An architecture may override this. */ 46 #ifndef MMAP_CALL 47 # define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \ 48 INLINE_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset) 49 #endif 50 51 #endif /* MMAP_INTERNAL_LINUX_H */ 52